u-boot/post/drivers/i2c.c

/*
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>

/*
 * I2C test
 *
 * For verifying the I2C bus, a full I2C bus scanning is performed.
 *
 * #ifdef I2C_ADDR_LIST
 *   The test is considered as passed if all the devices and
 *   only the devices in the list are found.
 * #else [ ! I2C_ADDR_LIST ]
 *   The test is considered as passed if any I2C device is found.
 * #endif
 */

#include <post.h>
#include <i2c.h>

#if CONFIG_POST & CONFIG_SYS_POST_I2C

int i2c_post_test (int flags)
{
	unsigned int i;
	unsigned int good = 0;
#ifdef I2C_ADDR_LIST
	unsigned int bad  = 0;
	int j;
	unsigned char i2c_addr_list[] = I2C_ADDR_LIST;
	unsigned char i2c_miss_list[] = I2C_ADDR_LIST;
#endif

	for (i = 0; i < 128; i++) {
		if (i2c_probe (i) == 0) {
#ifndef	I2C_ADDR_LIST
			good++;
#else	/* I2C_ADDR_LIST */
			for (j=0; j<sizeof(i2c_addr_list); ++j) {
				if (i == i2c_addr_list[j]) {
					good++;
					i2c_miss_list[j] = 0xFF;
					break;
				}
			}
			if (j == sizeof(i2c_addr_list)) {
				bad++;
				post_log ("I2C: addr %02X not expected\n",
						i);
			}
#endif	/* I2C_ADDR_LIST */
		}
	}

#ifndef	I2C_ADDR_LIST
	return good > 0 ? 0 : -1;
#else	/* I2C_ADDR_LIST */
	if (good != sizeof(i2c_addr_list)) {
		for (j=0; j<sizeof(i2c_miss_list); ++j) {
			if (i2c_miss_list[j] != 0xFF) {
				post_log ("I2C: addr %02X did not respond\n",
						i2c_miss_list[j]);
			}
		}
	}
	return ((good == sizeof(i2c_addr_list)) && (bad == 0)) ? 0 : -1;
#endif
}

#endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */